Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd80035ebcb8778b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 10:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0827923512b2d785d42973250d38dd22 SHA-1: 00de9128cd9ceca1e8f48a6c02a5a39abfa08cd9 SHA-256: dd80035ebcb8778bee04d6e875fa05abddc9a6c09fc5cb0022984c844e88f9f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=convert+pdf+to+word+online+no+email PDF link annotation
    • http://phantasos.org/userfiles/file/56327854862.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cpo66iqh1g6083b206bt8qtbd8/54812089699.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xapetanenuwosalakomawe.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/32676169698.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3c9b0193ffc80ff3a5f95a1157479386/23076021804.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cd22682d---25389830751.pdfIn PDF document text
    • https://hirurgija.me//files/xunijajizeto.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857aa8d04f5---23472156968.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/wawosibowufajoxegaju.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/47023502503.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7d02dc8ea0a05edf6a018e5f62bbf93/makalivovuf.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/95979664825.pdfIn PDF document text
    • https://baongochoa.com/upload/file/58990779324.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d82cceda---26467151714.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c992b79fa26---tefonasadola.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/39895102037.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8511de48a0---55769609526.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/12884856156.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb75e22f8---dagux.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jelid.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893b180a029---xunanunetajelavupofaxat.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/76178196671.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/29247790572.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/91514492437.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 14016 bytes
SHA-256: f610940037cb9ad952bb443ea34db0c2bb7c42f907d0393de81d7a1db5686b08
font_01_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 10672 bytes
SHA-256: 827a20eb371bcb02e7c1298e77fe9fa542096050b2fc54dd1f768781656c6191
font_02_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1